Should I buy a Supersprox (touted on their website as high perf.)

So I have taken delivery of my 43 tooth Supersprox to fit my 2003 Yamaha R1.  Fit was perfect.  As I was removing my stock steel sprocket and placing it on my workbench, I picked up the Supersprox with my free hand while I still had the stock one in my other hand getting ready to make the return trip back to the wheel.  I noticed by feel that the net weight of both units were nearly identical.  The original sprocket was not worn, as I had previously installed an aluminum sprocket and it was so badly worn that I temporarily installed the stock one, so the stock sprocket was nearly new.  Upon noticing the weight similarity I took both sprockets to my digital scale, and was surprised to find that the Supersprox was 51 grams heavier than stock.  So now I'm at odds as to why I purchased a high performance part.  Why is a Supersprox a high performance part?  How is it supposed to perform better at a 1% heavier, and cost twice as much as stock (the OEM replacement from www.boats.net is only $4.32 plus shipping).  Since I live in CA, not only did I pay shipping, but tax as well, and to top it off, I thought the price was going to be $10.00 less than what I paid as I saw the ad in RoadracerX and thought there was a sale, only to find out that it was for the 520 conversion, not the 530 OEM replacement.  Ok, I'll give you the fact that it's a bling item, but that's not why I purchased it, I purchased it because it's touted as a high performance part.  Maybe I missed something, so please let me know what I missed, maybe there is some other great feature.  

I'd contact them and let them know your findings.  

high performance in wear resistance maybe??  

I also bought the supersprox sprocket and chain replacement and noticed that only the front sprocket is actually lighter than stock because of the two rubber spacers or whatever that are on the stock front sprocket. I love the look of the gold sprocket and the gold chain but it makes it very apparent when the chain and sprocket are too greasy or dirty. I'm constantly wiping them both down. I'll post pics as soon as i figure out how.